0.70.2 T1: BLD-002 R0 land the release step table + baseline calculator #4679

Row T1 of aprender-a7's 0.70.2 PROPOSE-TICKET list (cop-inbox handoff/0702-propose-tickets.md), verbatim:

- T1 R0  release step table + baseline calculator. build-kaizen/bld002-r0 @ 3cdba57de1. Serves B5, B3 (baseline). K̂ 1.

Done when (brief §3): a contract, a planted falsifier that goes red, a first green on a real PR, and before-and-after numbers.

Train 0.70.2, P0. Owner: aprender-a7 (built by its workers aprender-a7w / aprender-a7n). Minted by the cop's clerk under C297 §4 / C298.